Stabilized pigmented polypropylene fiber resistant to gas fade.

摘要

Excellent stabilization of pigmented polypropylene (PP) fiber against gas fade upon exposure to atmospheric pollutants is obtained with a hindered amine containing a polysubstituted piperazin-2-one (PSP) moiety, for example, a C2-C12 alkylene connecting two PSP moieties, or a trisubstituted triazine ring with three PSP substituents, or a polyalkylene polyamine having pendant substituted oxo-piperazinyl-triazine moieties (PIP-T), that is, having pendant triazine rings substituted with PSP substituents. The stabilizers are unexpectedly effective when used without an antioxidant which produces yellowing, if used. Either pigmented or unpigmented PSP-stabilized PP fibers, and particularly fibers pigmented with white or pastel dyes, and having a non-alkaline "finish" are especially benefitted. Fibers made from PP stabilized with such a hindered amine, but lacking conventional antioxidants, have improved gas fade resistance, compared to fibers made from PP stabilized with several other commercially available hindered amines tested, including those which contain heterocyclic amines which are not PSPs, and especially those amines containing a hindered phenol moiety.